ASP-S2000-22-10 - GACOFLEX™ S2000 White Elastomeric Silicone Roof Coating

Nov 4, 2026

Application Specification ASP-S2000-22-10 sets requirements for a remedial roof coating using GACOFLEX™ S2000 White Elastomeric Silicone Roof Coating over existing smooth and granule-surfaced modified bitumen and smooth built-up roofing membranes (BUR). Use is limited to substrates in sound condition needing surface renewal from normal aging and use. Coating application details cover weathertight protection against UV and water, drainage slope needs, vapor transmission limitations, and guidance for tailoring project specifications. Submittals include product data, applicator qualifications, and substrate inspection reporting, plus recommended adhesion testing.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages6

Reading Time15 min

AccessFree to download

Part 1 – General

1.1 Summary

1.2 Related Sections

1.3 Submittals

1.4 Qualifications

Application Specification: ASP-S2000-22-10 Revised: 01/2024 DIVISION 07 01 50.61: GACOFLEX™ S2000 WHITE ELASTOMERIC SILICONE ROOF COATING FOR RESTORING MODIFIED BITUMEN AND SMOOTH BUILT-UP ROOFING MEMBRANE ASSEMBLIES PART 1 – GENERAL 1.1 SUMMARY A. This specification provides a remedial roof coating for application over existing smooth and granule-surfaced modified bitumen and smooth built-up roofing membranes (BUR), including mineral surfaced cap sheets (but excluding gravel-surfaced built-up roofs) . Application is restricted to circumstances in which the membrane substrate is in sound condition but requires a renewal of the surface due to the normal effects of aging and use. NOTE: This specification only includes GacoFlex S2000 White Elastomeric Silicone Roof Coating. Nonwhite (i.e. , colored) silicones are not approved for use on asphalt substrates. When properly applied, the GacoFlex S2000 White Elastomeric Silicone Roof Coating provides aweathertight membrane that protects the substrate from degradation caused by ultraviolet light (UV), water, and other normal weathering hazards. The substrate should have at least a 0.25 in (6 .4 mm) slope per foot to promote positive drainage. B. The GacoFlex S2000 White Elastomeric Silicone Roof Coating discussed in this specification has a moderate rate of water vapor transmission and is not recommended for use on cold storage or cryogenic structures that may have constant high-water vapor drive causing long-term accumulation of moisture in the roofing system that serves as a substrate for the GacoFlex S2000 White Elastomeric Silicone Roof Coating. C. This specification is intended only as a guide for the development of a project specification. The suitability of this specification for a particular project must be determined by a qualified representative of the owner. Conditions to check and corrections to consider are: • The type of pre-existing system must be identified. • All pre-existing membranes must be fully adhered or mechanically attached and intact. • The structural decking must be sound. Elements of this specification may require modification in order to clearly delineate project requirements. Sections that are not pertinent may be deleted. D. Adhesion tests are strongly recommended prior to bidding. A Coating Applicator that is licensed by the product manufacturer should perform wet and dry adhesion tests as instructed in GacoFlex General Instructions GW-1-3 Adhesion Testing Procedures using the products listed in Section 2.2. 1.2 RELATED SECTIONS | A. Cast-In-Place Concrete: | Division 03 30 00 | F. | Vapor /Air Barriers: | Division 07 25 00 | | --- | --- | --- | --- | --- | | B. Flashing/Sheet Metal: | Division 07 60 00 | G. | Board Insulation: | Division 07 22 00 | | C. Roof Accessories: | Division 07 72 00 | H. | Skylights: | Division 08 60 00 | | D. Rough Carpentry/Wood Blocking: | Division 06 10 00 | I . | Metal Decking: | Division 05 30 00 | | E. Drains, Vents and Penetrations: | Division 22 14 26.13 | | | | 1.3 SUBMITTALS A. PRODUCT DATA: Submit manufacturer’s standard submittal package including specification, installation instructions and general information for each waterproofing material. B. APPLICATOR QUALIFICATIONS: Submit current Letter of Good Standing from the specified waterproofing manufacturer. C. SUBSTRATE CONDITIONS: 1. Applicator to present to owner a completed inspection report verifying substrate condition and any noted defects not specifically addressed in regard to the installation of the coating. 2. Surface shall be free from loose dirt, stone, debris, moisture, and shall be in stable condition. Any work on the area to receive this application shall be completed prior to the installation of the coating. 3. Applicator shall complete a substrate inspection prior to the start of the installation of the coating. The architect/owner and Applicator shall accept the substrate. Start of the wo

FAQs

What existing roofing systems can the GACOFLEX™ S2000 White coating be applied over?

It applies over existing smooth and granule-surfaced modified bitumen and smooth built-up roofing membranes (BUR), including mineral surfaced cap sheets. Gravel-surfaced built-up roofs are excluded.

What are the key conditions for applying the coating?

Application is restricted to circumstances where the membrane substrate is in sound condition but needs surface renewal from normal aging and use. The substrate must be free of loose dirt, stone, debris, moisture, and be in stable condition, with appropriate drainage slope requirements.

What approvals and testing are required before or during bidding?

Adhesion tests are strongly recommended prior to bidding, performed by a licensed applicator using the referenced GacoFlex adhesion testing procedures. A mandatory Pre-Bid Conference is required, and approved alternates must be submitted with certification and independent laboratory test data.

Nov 4, 2026

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